This article is cited in 4 papers

Ferroelectricity

Thermal physical properties of ferroelectric ceramics PKR-7M near the diffuse phase transition

S. N. Kallaev^a, Z. M. Omarov^a, R. G. Mitarov^b, S. A. Sadykov<sup>c

a</sup> Daghestan Institute of Physics after Amirkhanov
^b Daghestan State Technical University
^c Daghestan State University, Makhachkala

Abstract: The thermal physical properties (heat capacity, thermal expansion coefficient, and deformation) of a relaxor piezoelectric ceramics based on the lead zirconate titanate PKR-7M have been studied in the temperature range 200–800 K. Diffuse anomalies have been revealed in the temperature dependences of the heat capacity and thermal expansion over wide temperature ranges 270–650 and 450–600 K, respectively. It has been shown that the anomalous behavior of the heat capacity is due to the manifestation of two-level states (Schottky anomalies). The results of the study have been discussed together with the data of structural studies.

Received: 07.12.2010

 English version: Physics of the Solid State, 2011, 53:7, 1378–1382

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